Compléter le  par « – » ou par « + » :

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Mathsenligne.net O PERATIONS SUR LES NOMBRES RELATIFS Exercice 4A

E XERCICE 1

Compléter le  par « – » ou par « + » :

a. (–6) + (–7) =  6  7

b. (+8) + (+3) =  8  3

c. (–5) – (+11) =  5  11

d. (+4) – (–9) =  4  9

e. (–10) – (–17) =  10  17 E XERCICE 2

Simplifier puis calculer :

a. (–5) + (+6) = =

b. (+9) – (+14) = =

c. (+13) + (–7) = =

d. (–10) – (+21) = =

e. (+25) – (–8) = =

f. (–19) + (–4) = =

g. (+3) + (+34) = =

h. (–7) – (–12) = =

i. (+6) + (–47) = =

j. (–24) + (+15) = =

E XERCICE 3

Simplifier puis calculer :

a. (–7,2) + (+4,1) = =

b. (+8,1) – (+8,5) = =

c. (+6,4) – (–5,2) = =

d. (–4,1) – (+7,9) = =

e. (+9,9) + (+6,6) = =

f. (–8,8) – (–7,7) = =

g. (–4,01) + (–2,3) = =

h. (+6,02) + (+9,003) = =

i. (–0,25) – (–8,75) = = j. (–9,103) + (–1,21) = = E XERCICE 4

Calculer :

a. –7 + 13 = b. 9 – 17 = c. –6 – 7 = d. 9 + 14 = e. 14 – 8 = f. –21 + 17 = g. 31 – 19 = h. 0 – 97 =

i. –12 – 41 = i. –53 + 53 =

k. 67 – 97 = l. –45 – 34 =

E XERCICE 5

Simplifier puis calculer :

A = (+6) – (+7) + (–12) – (–4) + (+9)

B = (–11) + (–14) – (+31) – (–21) + (+30)

C = (–1) + (–2) – (–3) + (–4) + (+5) – (+6)

D = (–23) + (+45) – (+67) + (+23) – (–45)

E = (–7,1) + (–9,5) – (–2,1) + (+1,7) – (+4,3)

E XERCICE 6 Calculer :

A = 11 – 25 – 31 + 61 – 29

B = –15 + 41 – 72 – 50 + 84

C = 7,2 – 1,5 + 6,3 – 7,9 – 4,6

D = –9,2 – 5,4 + 7,1 – 6,3 – 4,7

E = 8,3 + 7,2 – 6,5 – 0,7 + 6,5 – 4,1

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Mathsenligne.net O PERATIONS SUR LES NOMBRES RELATIFS Exercice 4A

La Providence - Montpellier

CORRIGE – M. QUET E XERCICE 1

Compléter le  par « – » ou par « + » : a. (–6) + (–7) = – 6 – 7

b. (+8) + (+3) = + 8 + 3

c. (–5) – (+11) = – 5 – 11

d. (+4) – (–9) = + 4 + 9

e. (–10) – (–17) = – 10 + 17

E XERCICE 2 :

a. (–5) + (+6) = –5 + 6 = 1 b. (+9) – (+14) = 9 – 14 = –5 c. (+13) + (–7) = 13 – 7 = 6 d. (–10) – (+21) = –10 – 21 = –31 e. (+25) – (–8) = 25 + 8 = 33

f. (–19) + (–4) = –19 – 4 = –23 g. (+3) + (+34) = 3 + 34 = 37 h. (–7) – (–12) = –7 + 12 = 5

i. (+6) + (–47) = 6 – 47 = –41 j. (–24) + (+15) = –24 + 15 = –9

E XERCICE 3 :

(–7,2) + (+4,1) = –7,2 + 4,1 = –3,1 (+8,1) – (+8,5) = 8,1 – 8,5 = –0,4 (+6,4) – (–5,2) = 6,4 + 5,2 = 11,6

(–4,1) – (+7,9) = –4,1 – 7,9 = –12 (+9,9) + (+6,6) = 9,9 + 6,6 = 16,5

(–8,8) – (–7,7) = –8,8 + 7,7 = –1,1 (–4,01) + (–2,3) = –4,01 – 2,3 = –6,31 (+6,02) + (+9,003) = 6,02 + 9,003 = 15,023

(–0,25) – (–8,75) = –0,25 + 8,75 = 8,5 (–9,103) + (–1,21) = –9,103 – 1,21 = –10,313

E XERCICE 4 :

a. –7 + 13 = 6 b. 9 – 17 = –8 c. –6 – 7 = –13 d. 9 + 14 = 23 e. 14 – 8 = 6 f. –21 + 17 = –4 g. 31 – 19 = 12 h. 0 – 97 = –97 i. –12 – 41 = –53 i. –53 + 53 = 0 k. 67 – 97 = –30 l. –45 – 34 = –79

E XERCICE 5 :

A = (+6) – (+7) + (–12) – (–4) + (+9) A = 6 – 7 – 12 + 4 + 9

A = 6 + 4 + 9 – 7 – 12 A = 19 – 19

A = 0

B = (–11) + (–14) – (+31) – (–21) + (+30) B = –11 – 14 – 31 + 21 + 30

B = –56 + 51 B = –5

C = (–1) + (–2) – (–3) + (–4) + (+5) – (+6) C = –1 – 2 + 3 – 4 + 5 – 6

C = +3 + 5 – 1 – 2 – 4 – 6 C = 8 – 13

C = – 5

D = (–23) + (+45) – (+67) + (+23) – (–45) D = –23 + 45 – 67 + 23 + 45

D = +45 + 23 + 45 – 23 – 67 D = 90 – 67

D = 23

E = (–7,1) + (–9,5) – (–2,1) + (+1,7) – (+4,3) E = –7,1 – 9,5 + 2,1 + 1,7 – 4,3

E = +2,1 + 1,7 – 7,1 – 9,5 – 4,3 E = 3,8 – 20,9

E = –17,1

E XERCICE 6 :

A = 11 – 25 – 31 + 61 – 29 A = 11 + 61 – 25 – 31– 29 A = 72 – 85

A = –13

B = –15 + 41 – 72 – 50 + 84 B = +41 + 84 – 15 – 72 – 50 B = 125 – 137

B = –12

C = 7,2 – 1,5 + 6,3 – 7,9 – 4,6 C = 7,2 + 6,3 – 1,5 – 7,9 – 4,6 C = 13,5 – 14

C = –0,5

D = –9,2 – 5,4 + 7,1 – 6,3 – 4,7 D = +7,1 – 9,2 – 5,4 – 6,3 – 4,7 D = +7,1 – 25,6

D = –18,5

E = 8,3 + 7,2 – 6,5 – 0,7 + 6,5 – 4,1 E = 8,3 + 7,2 – 0,7 – 4,1

E = 15,5 – 4,8

E = 10,7